*Excludes Observations that spanned multiple years

Pre 197010
19700
19710
19720
19730
19740
19750
19760
19770
19781
19791
19800
19810
19820
19830
19840
19850
19860
19872
19883
19890
19900
19911
19920
19930
19940
19950
19960
19973
19980
19990
20000
20010
20020
20030
20040
20052
20061
20071
20080
20090
20100
20110
20123
20130
20140
20150
20160
20170
20180
20190
20200
20210
20220
20230
20241
Total29