*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20003
20011
20021
20030
20041
20051
20063
20073
20082
20094
20101
20110
20121
20132
20141
20151
20161
20170
Total26