Year	Percent
1990	45.354
1991	47.322
1992	48.969
1993	51.256
1994	53.314
1995	54.554
1996	57.377
1997	58.265
1998	60.605
1999	62.97
2000	64.922
2001	66.024
2002	67.691
2003	67.373
2004	68.141
2005	69.669
2006	70.452
2007	71.933
2008	71.998
2009	71.819
2010	71.623
2011	71.568
2012	71.688
2013	72.544
2014	72.746
2015	73.181
2016	73.452
2017	73.593
2018	73.737
2019	73.883
2020	74.031
2021	74.183
2022	74.338
2023	74.5
2024	74.672
2025	74.86
2026	75.059
2027	75.273
2028	75.498
2029	75.731
2030	75.969