*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19981
19991
20000
20011
20020
20032
20042
20051
20062
20071
20082
20090
20100
20111
20126
20131
20141
20150
20160
20170
20181
20190
20200
20211
20228
20230
20240
Total32