*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19780
19791
19800
19810
19820
19831
19840
19851
19860
19870
19880
19890
19900
199181
199222
199337
19945
199510
199635
19970
19980
19990
20007
20012
20020
20030
20041
20050
20061
20070
20086
20090
20101
20112
20121
20133
20141
20151
20164
20176
201821
201926
20209
20210
20227
20236
20240
Total299