LIB1	LIB2	ALP1	ALP2
1984	49.8		50.2	
1987	50.7	50.4	49.3	49.6
1990		56.3		43.7
1993	50.4	52.9	49.6	47.1
1996	52.6		47.4	
1998	47.9		52.1	
2001	47.2	47.3	52.8	52.7
2004		47.3		52.7
2007		42.6		57.4
2010		43.9		56.1