*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
19912
19920
19930
19946
19952
19962
19970
19981
19991
20000
20010
20020
20030
20040
20051
20060
20072
20081
20091
201012
201111
201210
20138
20145
20156
20163
20170
20180
20190
20200
20210
20220
20230
20240
Total74