*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19761
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19913
19920
19931
19940
19952
19963
19972
19987
19990
20000
20010
20020
20030
20040
20050
20060
20070
20081
20092
201012
20119
201215
20136
201410
20159
20163
20170
20180
20190
20202
20210
20220
20230
20240
Total90