Year	Percent
1990	69.934
1991	69.9
1992	69.612
1993	69.636
1994	70.201
1995	72.22
1996	73.64
1997	75.206
1998	76.638
1999	76.302
2000	76.235
2001	76.363
2002	77.2
2003	75.228
2004	75.316
2005	74.614
2006	74.803
2007	75.964
2008	77.293
2009	76.405
2010	75.439
2011	75.486
2012	75.657
2013	75.847
2014	75.774
2015	75.996
2016	75.795
2017	75.88
2018	75.966
2019	76.058
2020	76.156
2021	76.223
2022	76.287
2023	76.355
2024	76.435
2025	76.532
2026	76.61
2027	76.699
2028	76.801
2029	76.907
2030	77.013