*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19762
19770
19780
19791
19801
19810
19820
19831
19842
19858
19864
19878
19885
19892
19902
19911
19922
19932
19940
19950
19960
19972
19980
19993
20008
20013
20022
200331
200426
200556
200650
200724
200849
200995
2010106
2011109
201224
20135
201422
201530
20161
20170
20180
Total688