Year	Percent
1990	80.02
1991	80.186
1992	80.419
1993	80.504
1994	80.873
1995	81.219
1996	81.565
1997	81.886
1998	82.19
1999	82.487
2000	82.784
2001	83.103
2002	83.429
2003	83.753
2004	84.062
2005	84.352
2006	84.639
2007	84.907
2008	85.161
2009	85.414
2010	85.477
2011	85.994
2012	86.751
2013	86.213
2014	86.447
2015	86.338
2016	86.221
2017	86.408
2018	86.578
2019	86.744
2020	86.915
2021	87.103
2022	87.295
2023	87.49
2024	87.683
2025	87.87
2026	88.066
2027	88.257
2028	88.444
2029	88.628
2030	88.81