*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
19921
19930
19940
19950
19961
19970
19980
19990
20001
20010
20020
20036
20041
20052
20064
20072
20084
20091
20101
20111
20123
20135
20144
20155
20165
20172
20180
Total49