*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19761
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19870
19880
19890
199012
19910
19920
19930
19940
199512
19960
19970
19980
19992
20003
20010
20020
20031
20040
200512
20065
200719
20087
20091
20100
20110
20120
20130
20140
20150
201611
20173
Total93