*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19831
19840
19850
19860
19870
19880
19890
19901
19911
19920
19935
19940
19950
19961
19972
19980
19990
20000
20010
20020
20034
20041
20050
20060
20072
20082
20093
20100
20114
20120
20133
20142
20150
20161
20170
20180
20190
20200
20210
20221
20230
20240
Total35