Year years 1990 67.934 1991 68.306 1992 68.592 1993 68.853 1994 69.413 1995 69.662 1996 70.055 1997 70.396 1998 70.632 1999 70.855 2000 70.388 2001 69.887 2002 70.969 2003 71.053 2004 71.182 2005 72.067 2006 71.915 2007 72.153 2008 72.413 2009 72.608 2010 73.004 2011 73.243 2012 73.466 2013 74.029 2014 72.622 2015 74.406 2016 74.554 2017 74.833 2018 74.793 2019 75.241 2020 74.403 2021 73.473 2022 73.444