Year	Percent
1990	20.432
1991	20.887
1992	21.273
1993	21.323
1994	21.923
1995	22.265
1996	22.52
1997	23.897
1998	25.331
1999	26.82
2000	22.4
2001	27.8
2002	30.16
2003	32.63
2004	35.2
2005	37.605
2006	40.073
2007	42.592
2008	45.15
2009	44.949
2010	45.55
2011	46.277
2012	47.008
2013	47.746
2014	48.417
2015	49.072
2016	49.723
2017	49.962
2018	50.201
2019	50.44
2020	50.679
2021	50.917
2022	51.156
2023	51.395
2024	51.634
2025	51.873
2026	52.112
2027	52.351
2028	52.59
2029	52.829
2030	53.068