*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197210
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19873
19887
19893
199027
199121
199220
19931
19940
19950
19960
19972
19980
19994
20000
20012
20022
20030
20040
20050
20060
20071
20081
20090
201013
201115
20122
20131
20141
20153
20161
20170
20180
20190
Total141