YEAR     P       Q      Y       Z
1922	26.8	65.7	541	74.0
1923	25.3	74.2	616	84.7
1924	25.3	74.0	610	80.2
1925	31.1	66.8	636	69.9
1926	33.3	64.1	651	66.8
1927	31.2	67.7	645	71.6
1928	29.5	70.9	653	73.6
1929	30.3	69.6	682	71.2
1930	29.1	67.0	604	69.6
1931	23.7	68.4	515	68.0
1932	15.6	70.7	390	74.8
1933	13.9	69.6	364	73.6
1934	18.8	63.1	411	70.2
1935	27.4	48.4	459	46.5
1936	26.9	55.1	517	57.6
1937	27.7	55.8	551	58.7
1938	24.5	58.2	506	58.0
1939	22.2	64.7	538	67.2
1940	19.3	73.5	576	73.7
1941	24.7	68.4	697	66.5