| Year | Value | | 2022 | 63.30185796917 | | 2021 | 62.042559785772 | | 2020 | 62.259763159373 | | 2019 | 66.441593302049 | | 2018 | 67.990761650109 | | 2017 | 68.389463986453 | | 2016 | 68.99235088412 | | 2015 | 73.789164754057 | | 2014 | 75.417928615178 | | 2013 | 76.970615665323 | | 2012 | 78.372995752618 | | 2011 | 78.161526223458 | | 2010 | 76.40813764916 | | 2009 | 72.788392111673 | | 2008 | 72.60780014504 | | 2007 | 75.745926260785 | | 2006 | 75.614219119368 | | 2005 | 75.596641263827 | | 2004 | 77.032938334978 | | 2003 | 79.585224810121 | | 2002 | 80.854423429131 | | 2001 | 82.045445092808 | | 2000 | 84.905899074877 | | 1999 | 86.474681010015 | | 1998 | 85.019034218304 | | 1997 | 92.649452243551 | | 1996 | 94.632159849582 | | 1995 | 95.3775202781 | | 1994 | 101.15752672947 | | 1993 | 103.14974593402 | | 1992 | 102.3602101793 | | 1991 | 100.60546474045 | | 1990 | 100.56145892646 |
|