*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19751
19761
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19931
19940
19950
19961
19972
19988
199915
200027
200119
200221
200320
200428
2005107
200686
200770
200871
200925
201082
201140
20123
20134
20140
20150
20160
20170
Total633