Year	Percent
1990	78.748
1991	78.099
1992	77.455
1993	76.771
1994	75.975
1995	75.037
1996	74.62
1997	74.108
1998	73.549
1999	73.019
2000	72.571
2001	73.033
2002	73.787
2003	74.791
2004	75.97
2005	77.239
2006	78.106
2007	78.596
2008	79.266
2009	80.082
2010	80.985
2011	81.747
2012	82.599
2013	83.513
2014	84.437
2015	84.694
2016	84.628
2017	85.091
2018	85.502
2019	85.885
2020	86.241
2021	86.393
2022	86.496
2023	86.57
2024	86.628
2025	86.676
2026	86.609
2027	86.521
2028	86.442
2029	86.403
2030	86.418