*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
197279
197331
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19842
198524
19866
198757
1988237
198936
1990200
1991417
1992247
1993115
19940
19950
19960
19970
19980
19990
20008
20013
20021
20030
20045
200520
20060
20070
20080
20090
201017
201182
20129
20131
20142
20152
20161
20172
20180
20190
Total1605