Year	Percent
1990	40.947
1991	40.809
1992	40.973
1993	41.138
1994	41.246
1995	41.571
1996	41.827
1997	42.213
1998	42.612
1999	43.073
2000	43.717
2001	44.156
2002	44.644
2003	45.145
2004	45.626
2005	46.082
2006	46.421
2007	46.711
2008	46.978
2009	47.262
2010	47.55
2011	47.768
2012	48.007
2013	48.272
2014	48.542
2015	48.831
2016	49.096
2017	49.361
2018	49.635
2019	49.913
2020	50.192
2021	50.47
2022	50.747
2023	51.024
2024	51.298
2025	51.566
2026	51.826
2027	52.081
2028	52.332
2029	52.575
2030	52.812