*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19761
19770
19780
19793
19800
19810
19820
19834
19840
19850
19866
19872
19880
19890
19900
19912
19924
199312
199411
199515
19966
199711
19983
199943
20000
20014
20024
20035
20040
20056
20062
20070
20082
20090
201023
201126
20121
20130
20140
20150
20161
20170
20180
Total198