Year	% (cumulative)
1970	4.6
1975	6.6
1980	10.09236
1985	12.65568
1988	16.38586
2005	13.51235
2006	13.14825
2007	12.82023
2008	13.17522
2012	16.49865
2013	13.77165
2015	15.02227
2017	17.39209
2018	18.50706