Year	%
1988	15.13533
1989	15.71462
1990	20.88422
1991	21.1868
1992	20.77558
1993	17.21824
1994	17.74051
1995	24.90896
1996	31.28151
1997	28.44493
1998	22.96523
1999	18.91264
2000	18.55474
2001	21.59943
2002	21.35761
2003	21.93359
2004	18.66892
2005	17.18664
2006	20.97429
2007	20.77506
2008	17.29213
2009	16.56008
2010	18.11398
2011	16.5732
2012	17.05898
2013	16.65655
2014	19.09314
2015	19.38812
2016	18.67354
2017	18.64967
2018	17.85365
2019	18.68754
2020	5.649583
2021	18.19871