*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19854
19860
19870
19880
19890
19900
19910
19920
19930
19941
19955
19961
19979
19988
19993
20002
200110
20020
20035
200429
200529
200627
200731
200814
20093
20106
20115
20122
20131
20143
20153
201610
20176
20180
Total218