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*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19851
19860
19870
19881
19890
19901
19910
19924
19933
19940
19952
19961
19970
19980
19990
20001
200130
200210
20030
20043
20050
20061
20070
20081
20090
20104
20110
20120
20132
20140
20150
20161
20172
20180
201920
20201
20211
20223
20231
20240
Total98