| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | 114.90 | 115.80 | 117.10 | 120 | 120.80 | 121.80 | 122.50 | |||||
| 2021 | 109 | 109.10 | 109.40 | 110.10 | 110.80 | 111.30 | 111.30 | 112.10 | 112.40 | 113.60 | 114.50 | 115.10 |
| 2020 | 108.20 | 108.60 | 108.60 | 108.50 | 108.50 | 108.60 | 109.10 | 108.60 | 109.10 | 109.10 | 108.90 | 109.20 |
| 2019 | 106.30 | 106.80 | 107 | 107.60 | 107.90 | 107.90 | 107.90 | 108.40 | 108.50 | 108.30 | 108.50 | 108.50 |
| 2018 | 104.40 | 104.90 | 105 | 105.40 | 105.80 | 105.80 | 105.80 | 106.50 | 106.60 | 106.70 | 107 | 107.10 |
| 2017 | 101.40 | 102.10 | 102.50 | 102.90 | 103.30 | 103.30 | 103.20 | 103.80 | 104.10 | 104.20 | 104.60 | 104.90 |
| 2016 | 99.50 | 99.80 | 100.20 | 100.20 | 100.40 | 100.60 | 100.60 | 100.90 | 101.10 | 101.20 | 101.40 | 101.90 |
| 2015 | 99.30 | 99.50 | 99.70 | 99.90 | 100.10 | 100.20 | 100 | 100.30 | 100.20 | 100.30 | 100.30 | 100.30 |
| 2014 | 99 | 99.50 | 99.70 | 100.10 | 100 | 100.20 | 99.90 | 100.20 | 100.30 | 100.40 | 100.10 | 100.10 |
| 2013 | 97.10 | 97.80 | 98.10 | 98.30 | 98.50 | 98.30 | 98.30 | 98.70 | 99.10 | 99.10 | 99.20 | 99.60 |
| 2012 | 94.60 | 95.10 | 95.40 | 96 | 95.90 | 95.50 | 95.60 | 96.10 | 96.50 | 97 | 97.20 | 97.60 |
| 2011 | 91.30 | 92 | 92.20 | 93.20 | 93.40 | 93.30 | 93.30 | 93.80 | 94.40 | 94.50 | 94.60 | 95.10 |
| 2010 | 87.80 | 88.20 | 88.70 | 89.20 | 89.40 | 89.50 | 89.30 | 89.80 | 89.80 | 90 | 90.30 | 91.20 |
| 2009 | 84.90 | 85.60 | 85.80 | 86 | 86.40 | 86.70 | 86.70 | 87 | 87.10 | 87.20 | 87.50 | 88 |
| 2008 | 82.40 | 83 | 83.40 | 84 | 84.60 | 85.20 | 85.10 | 85.70 | 86.10 | 85.90 | 85.80 | 85.50 |
| 2007 | 80.60 | 81 | 81.40 | 81.60 | 81.80 | 82 | 81.50 | 81.80 | 81.90 | 82.30 | 82.50 | 83 |
| 2006 | 78.50 | 78.80 | 78.90 | 79.40 | 79.90 | 80.10 | 80 | 80.40 | 80.50 | 80.60 | 80.80 | 81.30 |
| 2005 | 77 | 77.20 | 77.50 | 77.80 | 78.10 | 78.10 | 78.20 | 78.40 | 78.60 | 78.70 | 78.70 | 78.90 |
| 2004 | 75.80 | 76 | 76.10 | 76.40 | 76.60 | 76.60 | 76.40 | 76.60 | 76.70 | 76.90 | 77 | 77.40 |
| 2003 | 74.70 | 75 | 75.30 | 75.50 | 75.50 | 75.40 | 75.30 | 75.60 | 75.90 | 76 | 75.90 | 76.20 |
| 2002 | 73.70 | 73.80 | 74.10 | 74.40 | 74.60 | 74.60 | 74.40 | 74.60 | 74.80 | 74.90 | 74.90 | 75.20 |
| 2001 | 72.60 | 72.70 | 73 | 73.40 | 74 | 74.10 | 73.60 | 73.90 | 74.10 | 73.90 | 73.80 | 74 |
| 2000 | 71.90 | 72.20 | 72.30 | 72.60 | 72.80 | 72.90 | 72.50 | 72.50 | 73.10 | 73.10 | 73.20 | 73.20 |
| 1999 | 71.40 | 71.50 | 71.90 | 72.20 | 72.40 | 72.30 | 71.90 | 72.10 | 72.40 | 72.30 | 72.40 | 72.60 |
| 1998 | 70.30 | 70.50 | 70.70 | 71.10 | 71.40 | 71.30 | 71 | 71.20 | 71.50 | 71.50 | 71.60 | 71.80 |
| 1997 | 69.20 | 69.40 | 69.50 | 69.80 | 70 | 70.20 | 69.90 | 70.30 | 70.60 | 70.60 | 70.60 | 70.70 |
| 1996 | 67.80 | 68.10 | 68.40 | 68.70 | 68.90 | 69 | 68.60 | 68.90 | 69.30 | 69.30 | 69.30 | 69.50 |
| 1995 | 66 | 66.30 | 66.70 | 67 | 67.40 | 67.40 | 67.10 | 67.40 | 67.70 | 67.60 | 67.60 | 68 |
| 1994 | 64.50 | 64.80 | 65 | 65.50 | 65.80 | 65.80 | 65.40 | 65.70 | 65.80 | 65.70 | 65.70 | 66 |
| 1993 | 62.80 | 63.20 | 63.60 | 64.30 | 64.50 | 64.50 | 64.20 | 64.50 | 64.80 | 64.70 | 64.60 | 64.70 |
| 1992 | 61.40 | 61.70 | 62 | 62.70 | 62.90 | 62.90 | 62.60 | 62.70 | 62.90 | 63.10 | 63.10 | 63.20 |
| 1991 | 57.40 | 57.70 | 57.90 | 59.90 | 60.30 | 60.60 | 60.50 | 60.90 | 61.10 | 61.30 | 61.50 | 61.60 |
| 1990 | 53.60 | 54 | 54.20 | 55.20 | 55.70 | 55.90 | 55.80 | 56.40 | 57 | 57.40 | 57.50 | 57.50 |
| 1989 | 50.80 | 51 | 51.20 | 51.90 | 52.20 | 52.30 | 52.30 | 52.40 | 52.70 | 53.10 | 53.30 | 53.40 |
| 1988 | 48.40 | 48.60 | 48.70 | 49.30 | 49.50 | 49.70 | 49.70 | 49.90 | 50.10 | 50.30 | 50.50 | 50.60 |