1920	2.7
1921	-0.2
1922	1.9
1923	5.2
1924	3
1925	5.1
1926	5.6
1927	4.2
1928	3
1929	5.1
1930	1
1931	-3.4
1932	-6.2
1933	-5.1
1934	-3
1935	-1.3
1936	2.1
1937	2
1938	-1.9
1939	1.3
1940	3.3
1941	4.9