*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197212
19733
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19860
198722
198813
19895
199070
199187
199232
199348
19941
19957
19960
19972
19982
19990
20000
20010
20025
20031
20040
20050
20060
20072
20081
20090
20100
20111
20121
20131
20141
20150
20163
201726
20180
Total349