Year	Percent
1990	52.464
1991	53.489
1992	55.158
1993	55.828
1994	57.219
1995	58.141
1996	59.488
1997	61.171
1998	62.415
1999	64.268
2000	65.624
2001	66.842
2002	67.711
2003	68.537
2004	69.172
2005	69.933
2006	70.67
2007	72.241
2008	73.351
2009	74.051
2010	72.578
2011	72.821
2012	73.885
2013	74.282
2014	73.768
2015	74.653
2016	74.969
2017	75.223
2018	75.462
2019	75.703
2020	75.953
2021	76.209
2022	76.47
2023	76.738
2024	77.017
2025	77.31
2026	77.614
2027	77.93
2028	78.258
2029	78.598
2030	78.95