*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19831
19840
19850
19862
19871
198824
19890
19904
19913
19929
199312
19943
19957
19960
19972
19982
19990
20001
20012
20020
20033
20046
20056
20063
20070
20081
20092
20100
20111
20127
20131
20142
20150
20160
20170
Total109