X1973	X1974	X1975	X1976
2.8	3.6	1.4	2
5.9	1.7	.9	2.2
3.3	5.1	1.1	.9
4.4	2.2	3.2	1.1
1.7	2.1	.8	.5
3.8	4.1	1.5	1.2
6.6	4.7	2.8	1.4
3.1	2.7	1.4	3.5
0	1.3	.5	1.2