*Excludes Observations that spanned multiple years

Pre 197015
19700
19710
19720
19730
19741
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19981
19990
20001
20012
20020
20032
20041
20052
20060
20070
20080
20090
20100
20110
20120
20130
20140
20150
20160
20172
20180
20190
20200
20210
20221
20230
20240
Total30