Year	%
1988	46.97668
1991	53.3222
1993	31.17543
1996	9.057352
1997	7.960026
1998	7.406605
1999	6.514381
2000	4.747822
2001	6.045896
2002	4.647954
2003	5.78524
2004	4.485978
2005	2.940376
2006	11.87469
2007	14.23996
2008	3.323084
2009	3.436401
2010	3.226696
2011	3.24517
2012	3.265666
2013	4.964063
2014	2.401735
2016	4.065566
2020	9.118407
2021	9.100573