Year	Percent
1990	46.565
1991	46.868
1992	47.015
1993	47.206
1994	47.103
1995	47.136
1996	47.01
1997	46.982
1998	47.169
1999	47.201
2000	47.106
2001	47.282
2002	47.26
2003	47.136
2004	46.843
2005	47.688
2006	48.108
2007	48.196
2008	47.647
2009	48.404
2010	48.595
2011	49.347
2012	48.949
2013	48.873
2014	49.639
2015	49.405
2016	49.395
2017	49.577
2018	49.756
2019	49.921
2020	50.067
2021	50.195
2022	50.307
2023	50.407
2024	50.503
2025	50.6
2026	50.696
2027	50.794
2028	50.894
2029	50.992
2030	51.088