*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
19981
19991
20000
20011
20020
20034
20041
20052
20062
20072
20085
20091
20100
20110
20126
20132
20140
20152
20163
20179
20182
20198
20202
20213
20229
20230
20240
Total66