Year	Percent
1990	33.457
1991	34.005
1992	34.877
1993	35.855
1994	36.374
1995	37.619
1996	37.541
1997	39.597
1998	39.345
1999	38.526
2000	38.883
2001	38.18
2002	38.922
2003	38.451
2004	40.653
2005	41.32
2006	42.506
2007	42.923
2008	42.795
2009	43.333
2010	43.174
2011	43.501
2012	44.566
2013	44.565
2014	43.56
2015	43.903
2016	43.969
2017	44.123
2018	44.276
2019	44.423
2020	44.559
2021	44.693
2022	44.82
2023	44.935
2024	45.035
2025	45.117
2026	45.194
2027	45.255
2028	45.303
2029	45.341
2030	45.371