maximum minimum geometric mean 6 20191201 20191204 20191207 20191210 20191213 20191216 20191219 20191222 20191225 20191228 20191231 20200103 20200106 20200110 20200113 20200118 -6 20191201 20191204 20191207 20191210 20191213 20191216 20191219 20191222 20191225 20191228 20191231 20200103 20200106 20200110 20200113 20200118 0 20191201 20191204 20191207 20191210 20191213 20191216 20191219 20191222 20191225 20191228 20191231 20200103 20200106 20200110 20200113 20200118