*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19862
19872
19880
19890
19900
19912
19923
19934
19945
19957
19961
19972
19980
19991
20002
20012
20020
20030
20040
20051
20060
20070
20080
20090
20104
201112
201229
201332
20148
20154
20165
20171
20181
20190
20200
20210
20220
Total131