*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19751
19760
19770
19782
19790
19801
19811
19820
198312
19840
19850
19866
19872
19887
19899
199015
19914
199227
199321
199417
199525
19967
19979
199823
199911
20004
200113
20021
200322
200471
200532
200615
200724
200825
200927
201052
2011129
201249
201353
201488
201588
201695
2017114
20180
Total1107