Year	Percent
1990	46.5
1991	46.46
1992	46.42
1993	46.38
1994	46.34
1995	46.3
1996	46.24
1997	46.18
1998	46.12
1999	46.06
2000	46
2001	46.3
2002	46.599
2003	46.899
2004	47.2
2005	47.5
2006	47.393
2007	47.432
2008	47.212
2009	47.195
2010	46.193
2011	46.455
2012	46.388
2013	46.442
2014	46.381
2015	46.214
2016	46.156
2017	46.142
2018	46.128
2019	46.114
2020	46.1
2021	46.086
2022	46.072
2023	46.058
2024	46.044
2025	46.03
2026	46.016
2027	46.002
2028	45.988
2029	45.974
2030	45.96