Year	Percent
1990	2.76262
1991	2.68377
1992	2.52608
1993	2.42065
1994	2.33695
1995	3.28458
1996	3.56196
1997	3.54692
1998	3.49008
1999	3.27932
2000	3.26631
2001	3.69372
2002	3.7543
2003	3.60021
2004	3.50665
2005	3.34956
2006	3.47038
2007	3.32034
2008	3.26977
2009	3.17245
2010	2.90711
2011	2.87494
2012	2.82797
2013	2.76823
2014	2.72543
2015	2.73569
2016	2.70147
2017	2.74741
2018	2.79433
2019	2.81397
2020	2.8039