*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19902
19910
19921
19936
19940
19950
19960
19970
19980
19990
20000
20010
20020
20032
20049
20050
20063
20074
20083
20099
20102
20115
20122
20133
20146
20151
20163
20175
20188
20195
20201
20210
20221
20231
20242
Total85