Year	Percent
1990	29.856
1991	30.38
1992	30.976
1993	31.45
1994	32.861
1995	34.295
1996	35.752
1997	37.223
1998	38.709
1999	40.208
2000	41.719
2001	43.244
2002	44.777
2003	46.311
2004	47.835
2005	49.34
2006	50.827
2007	52.287
2008	53.72
2009	55.126
2010	56.197
2011	57.28
2012	58.457
2013	58.631
2014	58.358
2015	58.968
2016	58.623
2017	58.805
2018	58.968
2019	59.122
2020	59.27
2021	59.43
2022	59.587
2023	59.738
2024	59.877
2025	60.002
2026	60.135
2027	60.259
2028	60.372
2029	60.476
2030	60.571