Year	Percent
1990	47.388
1991	49.113
1992	50.496
1993	52.062
1994	54.486
1995	55.658
1996	57.249
1997	58.794
1998	59.307
1999	60.506
2000	62.686
2001	60.835
2002	64.696
2003	66.83
2004	68.651
2005	69.669
2006	71.654
2007	73.156
2008	75.092
2009	77.052
2010	78.651
2011	79.626
2012	80.985
2013	81.682
2014	81.917
2015	81.967
2016	82.266
2017	82.519
2018	82.768
2019	83.014
2020	83.256
2021	83.498
2022	83.741
2023	83.991
2024	84.251
2025	84.526
2026	84.816
2027	85.119
2028	85.439
2029	85.78
2030	86.143