*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19810
19820
19830
19840
19851
19860
19870
198835
19890
19904
19910
199232
199318
19940
19952
19967
19972
19980
19991
20000
20010
20024
20030
20040
20050
20060
20070
20080
20090
20100
20110
20121
20130
20141
20150
20160
20170
20180
20190
20200
20210
20221
20232
20241
Total113