Year	Percent
1990	37.396
1991	37.868
1992	38.42
1993	38.89
1994	40.735
1995	42.599
1996	44.484
1997	46.381
1998	48.291
1999	50.211
2000	52.14
2001	54.073
2002	56
2003	57.916
2004	59.817
2005	61.699
2006	63.558
2007	65.386
2008	67.178
2009	68.924
2010	70.078
2011	71.054
2012	72.251
2013	72.478
2014	72.476
2015	73.821
2016	73.295
2017	73.626
2018	73.96
2019	74.299
2020	74.642
2021	74.991
2022	75.344
2023	75.698
2024	76.045
2025	76.382
2026	76.711
2027	77.032
2028	77.347
2029	77.662
2030	77.981