Year	Percent
1990	35.249
1991	36.049
1992	35.519
1993	36.489
1994	37.814
1995	38.818
1996	37.258
1997	40.537
1998	43.122
1999	43.34
2000	41.805
2001	45.316
2002	45.706
2003	45.069
2004	44.735
2005	48.772
2006	48.51
2007	49.979
2008	50.369
2009	50.852
2010	48.715
2011	51.101
2012	50.796
2013	51.821
2014	54.834
2015	54.513
2016	50.706
2017	51.219
2018	51.733
2019	52.24
2020	52.733
2021	53.212
2022	53.671
2023	54.116
2024	54.564
2025	55.026
2026	55.502
2027	55.991
2028	56.49
2029	56.99
2030	57.487