Year	Percent
1990	50
1991	50.179
1992	50.431
1993	50.624
1994	50.823
1995	50.995
1996	51.153
1997	51.3
1998	51.449
1999	51.589
2000	51.724
2001	51.848
2002	51.968
2003	52.086
2004	52.19
2005	52.308
2006	52.423
2007	52.534
2008	52.658
2009	52.798
2010	52.954
2011	53.109
2012	53.27
2013	53.43
2014	53.57
2015	53.679
2016	53.752
2017	53.805
2018	53.824
2019	53.792
2020	53.701
2021	53.555
2022	53.356
2023	53.123
2024	52.879
2025	52.64
2026	52.413
2027	52.194
2028	51.98
2029	51.769
2030	51.559