NAT1	NAT2	ALP1	ALP2
1984	55.1		44.9	
1987	54.5		45.5	
1990	49.3	49.2	50.7	50.8
1993		49.9		50.1
1996		54.3		45.7
1998	53.4	52.4	46.6	47.6
2001	52.8		47.2	
2004	54.2	54.5	45.8	45.5
2007		47.6		52.4
2010		45.8		54.2