*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19729
19732
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19842
19850
19860
198718
19885
19891
19905
199124
199230
19931
19940
19951
19960
19970
19980
19999
200011
20011
20021
20035
200415
200511
200619
200720
200817
20098
201053
201156
201219
201317
201411
201513
201615
201714
201825
20190
Total439