Year	Percent
1990	39.494
1991	40.324
1992	41.126
1993	41.49
1994	41.442
1995	42.016
1996	42.671
1997	44.007
1998	45.355
1999	46.711
2000	48.073
2001	49.439
2002	50.799
2003	52.15
2004	53.492
2005	54.823
2006	56.165
2007	57.521
2008	58.882
2009	60.244
2010	61.606
2011	63.805
2012	65.894
2013	65.868
2014	65.811
2015	65.728
2016	65.457
2017	65.883
2018	66.307
2019	66.731
2020	67.157
2021	67.582
2022	68.006
2023	68.431
2024	68.856
2025	69.282
2026	69.71
2027	70.139
2028	70.57
2029	71.003
2030	71.436