*Excludes Observations that spanned multiple years

Pre 197023
19700
19711
19720
19730
19741
19750
19761
19770
19780
19791
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19951
19960
19971
19980
19990
20000
20010
20020
20031
20040
20050
20060
20071
20080
20091
20100
20110
20120
20130
20141
20150
20160
20170
20185
20191
20202
20211
20221
20232
20245
Total52