Year	Percent
1990	44.978
1991	45.011
1992	45.014
1993	45.002
1994	45.259
1995	45.511
1996	45.729
1997	45.949
1998	46.182
1999	46.435
2000	46.713
2001	47.072
2002	47.437
2003	47.803
2004	48.168
2005	48.532
2006	48.897
2007	49.255
2008	49.602
2009	49.937
2010	50.259
2011	50.571
2012	50.865
2013	50.923
2014	50.954
2015	51.04
2016	51.081
2017	51.225
2018	51.368
2019	51.508
2020	51.647
2021	51.784
2022	51.918
2023	52.051
2024	52.185
2025	52.323
2026	52.463
2027	52.604
2028	52.749
2029	52.902
2030	53.066