Year	Percent
1990	66.092
1991	65.971
1992	65.87
1993	65.958
1994	65.993
1995	65.933
1996	66.415
1997	66.851
1998	66.815
1999	67.362
2000	67.739
2001	67.545
2002	68.038
2003	67.922
2004	68.296
2005	68.679
2006	69.1
2007	68.854
2008	69.192
2009	69.299
2010	69.2
2011	69.454
2012	70.019
2013	70.672
2014	71.165
2015	71.559
2016	72.055
2017	72.222
2018	72.364
2019	72.48
2020	72.573
2021	72.622
2022	72.638
2023	72.642
2024	72.665
2025	72.726
2026	72.806
2027	72.922
2028	73.07
2029	73.243
2030	73.435