Year	Percent
1990	42.281
1991	44.608
1992	47.259
1993	46
1994	46.842
1995	44.078
1996	45.547
1997	46.848
1998	47.319
1999	49.79
2000	51.731
2001	51.633
2002	53.203
2003	53.267
2004	55.674
2005	56.937
2006	58.422
2007	58.419
2008	58.265
2009	60.219
2010	60.066
2011	60.575
2012	62.471
2013	62.582
2014	63.459
2015	65.334
2016	64.185
2017	64.274
2018	64.4
2019	64.564
2020	64.765
2021	64.901
2022	65.075
2023	65.285
2024	65.53
2025	65.804
2026	66.018
2027	66.245
2028	66.489
2029	66.75
2030	67.027