| 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 |
| 1,127.14 | 1,193.66 | 1,215.74 | 1,133.04 | 1,233.82 | 1,308.49 | 1,257.09 | 1,282.80 | 1,370.63 | 1,463.39 | 1,535.35 | 1,826.71 | 1,745.99 | 1,956.11 | 2,101.67 | 2,190.35 | 2,303.78 | 2,340.37 | 2,703.30 | 2,481.22 | 2,330.57 | 2,069.09 | 2,085.79 | 1,877.38 | 1,838.26 | 1,962.99 | 2,320.41 | 2,119.33 | 1,636.24 | 1,530.41 | 2,925.24 |