Year	% of total primary
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1999	0.996200025081635
2000	0.944830000400543
2003	1.16305994987488
2005	2.1943199634552
2007	1.77676999568939
2008	2.48288011550903
2009	2.70146989822388
2010	5.02412986755371
2011	6.45031023025513
2012	7.13001012802124
2020	8.72708034515381
2021	9.44649028778076