Year	%
1988	70.80219
1989	70.00498
1990	70.67404
1992	70.97585
1995	54.36372
1996	55.04464
1997	55.04464
1998	55.04464
1999	60
2000	60.70679
2001	60.76766
2002	52.39804
2003	52.70748
2005	36.79183
2006	36.86274
2008	37.46096
2009	37.05309
2010	38.58863
2011	37.44978
2013	42.23442
2014	39.20902
2015	33.86807
2016	33.80262
2020	52.83568
2021	50.91523