*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19852
19860
19870
19881
19890
19900
19915
199229
199310
19941
19957
19966
19970
19981
19991
20005
20010
20021
20030
20040
20050
20069
20070
20081
20093
20100
20114
20120
20131
20141
20150
20161
20170
201812
20196
20203
20212
20229
20230
20240
Total123