*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19892
19901
19915
19921
19935
19943
19951
19960
19978
19982
19991
20001
20019
20023
20030
20047
20051
20062
20076
20082
20091
20100
20110
20120
20130
20141
20150
20161
20170
201812
20191
20207
20217
20226
20230
20240
Total97