Year	Percent
1990	78.763
1991	78.696
1992	78.674
1993	78.785
1994	78.742
1995	78.824
1996	78.847
1997	78.856
1998	78.827
1999	78.866
2000	78.91
2001	78.763
2002	78.647
2003	78.586
2004	78.55
2005	78.541
2006	78.931
2007	79.317
2008	79.7
2009	80.079
2010	80.453
2011	80.833
2012	81.209
2013	81.5
2014	81.809
2015	82.116
2016	82.386
2017	82.564
2018	82.738
2019	82.909
2020	83.075
2021	83.235
2022	83.391
2023	83.543
2024	83.692
2025	83.841
2026	83.988
2027	84.135
2028	84.283
2029	84.435
2030	84.592