*Excludes Observations that spanned multiple years

Pre 19700
19700
19714
197211
19732
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
198430
19851
198620
198733
198832
19893
199018
199116
19923
199310
19943
19952
19961
19975
19982
19991
20000
20010
20024
20030
20040
20050
20060
20071
20080
20090
20100
20110
20121
20130
20140
20150
20160
20170
20180
Total204