*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19860
19878
19885
19893
199025
199126
19926
19932
19945
19952
19961
199719
19981
19990
20000
20011
20024
20031
20041
20050
20060
20071
20082
20092
20100
20110
20120
20132
20141
20154
20164
201725
20182
Total155