Year	Percent
1990	13.66757
1991	12.58094
1992	11.75279
1993	10.89334
1994	10.19177
1995	12.43865
1996	11.96526
1997	12.10934
1998	11.81221
1999	11.53282
2000	12.52671
2001	9.17742
2002	9.0287
2003	9.03692
2004	8.61589
2005	8.31658
2006	7.84849
2007	6.93597
2008	6.77767
2009	6.45908
2010	6.37073
2011	6.2471
2012	6.563
2013	6.26933
2014	5.66604
2015	4.97517
2016	4.55883
2017	4.29823
2018	3.74852
2019	4.15501
2020	3.96896