Year	Percent
1990	76.47
1991	76.28
1992	77.714
1993	78.209
1994	78.93
1995	81.569
1996	79.87
1997	78.758
1998	80.957
1999	83.108
2000	85.788
2001	84.649
2002	83.532
2003	83.396
2004	83.051
2005	82.486
2006	83.234
2007	82.612
2008	81.647
2009	81.041
2010	81.571
2011	81.458
2012	82.358
2013	83.259
2014	84.431
2015	85.716
2016	86.168
2017	86.052
2018	85.937
2019	85.825
2020	85.715
2021	85.607
2022	85.499
2023	85.393
2024	85.296
2025	85.209
2026	85.134
2027	85.07
2028	85.012
2029	84.95
2030	84.878