YM	DM1	DM2	DM5	DM10	DM15	DM20	DM25
1911-15	0.506	0.751	1.523	2.390	2.839	3.029	3.078
1921-25	0.440	0.700	1.399	2.057	2.337	2.456	2.492
1931-35	0.393	0.651	1.267	1.852	2.174	2.302	2.336
1941-45	0.261	0.524	1.175	1.849	2.151	2.267	
1951-55	0.333	0.646	1.478	2.301			
1961-65	0.382	0.684