Year	%
1988	3.21
1993	3.05
1995	49.17
1996	45.18
1997	46.05
1998	49.77
1999	45.36
2000	49.51
2001	44.94
2002	47.85
2003	46.71
2004	46.35
2005	48.32
2006	47.61
2007	46.2
2008	41.1
2009	39.43
2010	42.32
2011	42.17
2012	41.89
2013	41.12
2014	40.28
2015	38.53
2016	36.32
2017	35.23
2018	34.14
2019	34.97
2020	41.79
2021	31.9