Year	Percent
1990	28.851
1991	28.938
1992	29.514
1993	30.18
1994	30.917
1995	31.672
1996	32.203
1997	32.73
1998	33.317
1999	34.004
2000	34.776
2001	35.492
2002	36.205
2003	37.044
2004	37.971
2005	38.943
2006	39.651
2007	40.505
2008	41.501
2009	42.604
2010	43.763
2011	43.004
2012	43.203
2013	43.405
2014	43.615
2015	43.801
2016	43.901
2017	44.036
2018	44.21
2019	44.402
2020	44.599
2021	44.325
2022	44.132
2023	44.033
2024	44.03
2025	44.095
2026	44.053
2027	44.08
2028	44.164
2029	44.305
2030	44.492