*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19854
19860
19878
198817
19891
19909
19914
199213
19934
19949
19957
19965
19978
199810
19992
20005
20012
20020
20030
20042
20053
20061
20072
20081
20090
20100
20114
201214
201330
20145
20154
20164
20170
20182
20191
20200
20210
20220
Total181