| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 |
| 1,618.27 | 1,634.23 | 1,688.90 | 1,685.22 | 1,696.66 | 1,751.56 | 1,846.77 | 1,902.09 | 1,959.34 | 2,042.61 | 2,107.92 | 2,108.15 | 2,091.73 | 2,999.19 | 3,162.53 | 3,132.09 | 3,362.39 | 3,401.44 | 3,591.84 | 3,004.19 | 3,157.19 | 3,218.03 | 3,411.95 | 4,067.20 | 3,998.17 | 4,492.91 | 4,829.19 | 3,477.80 | 4,373.12 | 4,448.99 | 4,383.87 |