*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197216
197315
19741
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19888
19891
19902
199129
199230
199326
19941
19950
19960
19971
19980
19990
20000
20012
20025
20031
20041
20050
20060
20071
20089
20090
20104
201131
20120
20130
20142
20150
20162
20174
20180
20190
Total192