Year	Percent
1991	67.739
1992	68.35
1993	69.678
1994	70.346
1995	70.899
1996	72.021
1997	72.874
1998	73.405
1999	74.428
2000	75.115
2001	75.189
2002	75.954
2003	76.429
2004	79.095
2005	79.356
2006	79.971
2007	80.465
2008	81.314
2009	82.51
2010	83.188
2011	83.139
2012	83.629
2013	83.879
2014	84.264
2015	84.338
2016	84.589
2017	84.335
2018	84.582
2019	84.788
2020	84.921
2021	85.078
2022	85.231