Year	Percent
1990	45.396
1991	45.536
1992	45.665
1993	45.795
1994	45.941
1995	46.112
1996	46.298
1997	46.517
1998	46.747
1999	46.962
2000	47.15
2001	47.227
2002	47.27
2003	47.302
2004	47.456
2005	47.344
2006	47.214
2007	47.078
2008	46.947
2009	46.981
2010	46.855
2011	46.651
2012	46.401
2013	46.13
2014	45.896
2015	45.716
2016	45.522
2017	45.464
2018	45.406
2019	45.313
2020	45.164
2021	44.981
2022	44.753
2023	44.494
2024	44.227
2025	43.966
2026	43.73
2027	43.502
2028	43.276
2029	43.044
2030	42.798