*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19883
19890
19900
19916
19924
199310
19940
199511
19960
199725
19984
199915
20000
20011
20027
20030
20041
200510
20063
20072
20084
20096
20100
20110
20121
20130
20140
20150
20161
20170
Total115