*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19863
19871
19880
19890
19902
19912
19925
19935
19943
19953
19963
19975
19983
19994
20001
200111
20028
20031
200411
20054
20068
20077
20088
20092
20106
20117
20123
20134
20149
20155
201610
20175
20181
Total150