Year	%
1990	37.82045
1993	40.52888
1995	45.89021
1996	41.86542
1997	37.62429
1998	35.53408
1999	37.07483
2000	36.9614
2001	38.52436
2002	36.87175
2003	37.91603
2004	37.40918
2005	40.57053
2006	37.70107
2007	33.10455
2008	30.95702
2009	31.19703
2010	28.09994
2011	31.34241
2012	32.42157
2013	29.14916
2014	30.17323
2015	29.56101
2016	32.28555
2017	31.52004
2018	30.34628
2019	29.46581
2020	31.17542
2021	31.17267