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*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19822
19830
19840
19850
19860
19871
19880
19890
19900
19910
19921
19930
199412
19950
19963
19972
19982
19992
20000
20011
20023
20035
20041
200541
20060
20070
20081
200910
20100
201116
20129
201323
201438
201515
201675
201720
201873
2019134
20202
20210
Total493