Year	Percent
1990	20.213
1991	21.652
1992	23.185
1993	24.8
1994	26.475
1995	28.186
1996	29.974
1997	31.779
1998	33.61
1999	35.496
2000	37.457
2001	39.883
2002	42.409
2003	45.018
2004	47.69
2005	50.398
2006	53.086
2007	52.333
2008	51.597
2009	50.865
2010	50.122
2011	49.375
2012	48.615
2013	47.826
2014	46.996
2015	44.469
2016	42.377
2017	42.876
2018	43.333
2019	43.751
2020	44.129
2021	44.456
2022	44.75
2023	45.013
2024	45.256
2025	45.48
2026	45.688
2027	45.88
2028	46.062
2029	46.239
2030	46.406