Year	Percent
1991	11.24
1992	12.345
1993	13.249
1994	14.57
1995	15.595
1996	16.684
1997	18.156
1998	19.696
1999	21.142
2000	22.439
2001	23.89
2002	25.497
2003	26.561
2004	28.253
2005	30.508
2006	32.958
2007	35.771
2008	37.894
2009	40.167
2010	42.322
2011	44.823
2012	47.139
2013	49.545
2014	52.043
2015	54.615
2016	56.538
2017	57.872
2018	59.645
2019	61.257
2020	62.782
2021	64.253
2022	65.639