*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19852
19863
19872
19884
19892
19902
19912
19920
19930
19940
19951
199614
199719
199810
199920
200011
200117
200227
200327
200425
200525
200630
200723
200816
200923
201021
201121
201223
201317
201411
20153
20161
20170
20180
Total402