*Excludes Observations that spanned multiple years

Pre 19702
19700
19712
19720
19730
19740
19750
19760
19770
19781
19790
19801
19810
19820
19831
19841
19852
198614
19870
19885
19898
19904
19914
199219
19939
199456
199543
19964
199714
19986
199918
20001
20014
200221
20039
200445
200545
20064
20075
200815
20092
201046
201164
20129
201311
20149
20156
20164
20170
Total514