| 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 |
| 1,560.81 | 1,644.60 | 1,751.15 | 1,826.07 | 1,818.98 | 1,926.41 | 1,918.07 | 1,992.18 | 2,102.70 | 2,041.12 | 2,023.55 | 1,874.41 | 1,754.44 | 2,305.34 | 2,301.98 | 2,088.01 | 2,175.87 | 2,173.57 | 2,144.55 | 1,958.72 | 1,900.96 | 1,767.15 | 1,845.57 | 1,659.57 | 1,777.74 | 1,757.96 | 1,343.55 | 1,635.33 | 1,527.15 | 1,482.51 | 1,319.19 |