Year	%
1998	61.12916
1999	60.93655
2000	62.28268
2001	65.32729
2002	67.79238
2003	68.15734
2004	67.96352
2005	68.64702
2006	71.11364
2007	71.35227
2008	72.45075
2009	73.047
2010	72.57424
2011	74.52499
2012	73.17187
2013	74.80471
2014	73.50754
2015	76.04809
2016	74.73641
2017	76.40604