Year	Percent
1990	54.184
1991	54.495
1992	56.725
1993	56.106
1994	57.734
1995	59.162
1996	59.848
1997	60.57
1998	61.304
1999	61.904
2000	62.459
2001	64.357
2002	63.83
2003	63.302
2004	63.462
2005	63.567
2006	64.404
2007	64.938
2008	65.678
2009	66.399
2010	67.152
2011	67.971
2012	67.942
2013	67.215
2014	68.153
2015	68.12
2016	68.327
2017	68.602
2018	68.875
2019	69.148
2020	69.424
2021	69.712
2022	69.998
2023	70.284
2024	70.57
2025	70.858
2026	71.157
2027	71.458
2028	71.754
2029	72.036
2030	72.3