*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19860
19871
19880
19890
19901
19914
19920
19933
19946
19952
19962
19971
19980
19991
20000
20012
20020
20030
20040
20052
20066
20071
20080
20090
20100
20110
20123
20134
20143
20150
20160
20171
20180
20190
20200
20210
20220
20230
20240
Total50