Year	Percent
1990	74.58
1991	75.225
1992	75.418
1993	75.161
1994	75.185
1995	75.43
1996	75.114
1997	75.355
1998	76.051
1999	76.58
2000	77.067
2001	77.919
2002	78.61
2003	79.015
2004	79.381
2005	79.757
2006	79.99
2007	80.256
2008	80.391
2009	80.292
2010	80.283
2011	80.076
2012	79.85
2013	79.591
2014	79.337
2015	79.093
2016	78.932
2017	79.001
2018	79.054
2019	79.113
2020	79.196
2021	79.297
2022	79.428
2023	79.578
2024	79.722
2025	79.842
2026	79.935
2027	80.004
2028	80.054
2029	80.088
2030	80.112