*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19980
19990
20000
20010
20021
20031
20040
20050
20063
20071
20080
20091
20100
20110
20121
20134
20140
20151
20160
20173
20180
20192
20202
20214
20224
20233
20242
Total35