*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197211
19735
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19871
198824
19890
19901
199121
19922
19932
19941
19952
19961
19970
19983
19992
200018
200120
20022
20030
200430
20050
20066
20070
20080
20091
20100
20111
20126
20131
20141
20152
20165
20171
20181
20190
Total171