Year	Percent
1990	56.744
1991	57.873
1992	59.291
1993	60.495
1994	61.268
1995	62.606
1996	63.468
1997	64.436
1998	65.378
1999	66.138
2000	66.742
2001	67.51
2002	68.5
2003	69.504
2004	70.286
2005	70.964
2006	71.854
2007	72.43
2008	72.992
2009	73.323
2010	73.614
2011	73.981
2012	74.485
2013	75.014
2014	75.453
2015	75.827
2016	76.305
2017	76.594
2018	76.885
2019	77.166
2020	77.435
2021	77.693
2022	77.939
2023	78.176
2024	78.41
2025	78.645
2026	78.882
2027	79.117
2028	79.353
2029	79.589
2030	79.825