*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19831
19840
19850
19863
19871
198815
198913
19901
19914
19924
19936
19943
199513
19960
199717
19984
199926
200010
20010
20024
20031
20040
20054
20063
20070
20083
20090
201043
201112
20127
20135
20144
20150
20161
20170
Total211