*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19861
19871
19886
19891
19905
19915
19924
199328
19944
19957
199613
199711
199814
19998
20005
20018
20020
20034
20042
20052
20060
20071
20082
20090
20100
20111
20126
201314
201414
201510
20164
20170
20182
20190
20200
20210
20220
Total184