Year	Percent
1990	61.897
1991	61.655
1992	61.774
1993	61.656
1994	62.821
1995	64.061
1996	64.334
1997	64.116
1998	64.208
1999	64.241
2000	65.338
2001	66.015
2002	66.243
2003	67.093
2004	66.789
2005	68.225
2006	68.883
2007	69.44
2008	69.967
2009	70.121
2010	69.954
2011	70.422
2012	70.324
2013	70.394
2014	70.51
2015	71.236
2016	71.609
2017	71.784
2018	71.954
2019	72.126
2020	72.302
2021	72.473
2022	72.642
2023	72.815
2024	72.997
2025	73.194
2026	73.395
2027	73.611
2028	73.835
2029	74.057
2030	74.269