Year	%
1998	62.9172
1999	62.78857
2000	63.98762
2001	67.26609
2002	69.40871
2003	70.26502
2004	70.19538
2005	71.43542
2006	72.17427
2007	71.83019
2008	73.0617
2009	74.24873
2010	73.84715
2011	75.65167
2012	73.61827
2013	75.46429
2014	74.84378
2015	77.6323
2016	76.43605
2017	78.12188