*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19831
19840
19850
19860
19870
19881
19893
19902
19911
19920
19930
19947
19958
199611
199733
199811
199923
200010
200121
200211
200314
20045
200522
200617
200727
200815
200920
201038
201127
201217
201314
201425
201519
20160
20170
20180
Total405