+--------------+------------------------+-------------+-----------+ | | Price Index Number. | | Actual | | Per cent of +------------+-----------+ Purchasing | Exchange | | 1913 Parity. | Great | United | Power | (Monthly | | |Britain[31] |States[32] | Parity.[33] | Average). | +--------------+------------+-----------+-------------+-----------+ | 1919 Aug. | 242 | 216 | 89.3 | 87.6 | | Sept. | 245 | 210 | 85.7 | 85.8 | | Oct. | 252 | 211 | 83.7 | 85.9 | | Nov. | 259 | 217 | 83.8 | 84.3 | | Dec. | 273 | 223 | 81.7 | 78.4 | | 1920 Jan. | 289 | 233 | 81.0 | 75.6 | | Feb. | 303 | 232 | 76.6 | 69.5 | | March | 310 | 234 | 75.6 | 76.2 | | April | 306 | 245 | 80.1 | 80.6 | | May | 305 | 247 | 81.0 | 79.0 | | June | 291 | 243 | 83.5 | 81.1 | | July | 293 | 241 | 82.3 | 74.2 | | Sept. | 284 | 226 | 79.6 | 72.2 | | Oct. | 266 | 211 | 79.3 | 71.4 | | Nov. | 246 | 196 | 79.7 | 70.7 | | Dec. | 220 | 179 | 81.4 | 71.4 | | 1921 Jan. | 209 | 170 | 81.4 | 76.7 | | Feb. | 192 | 160 | 83.3 | 79.6 | | March | 189 | 155 | 82.0 | 80.3 | | April | 183 | 148 | 80.9 | 80.7 | | May | 182 | 145 | 79.7 | 81.5 | | June | 179 | 142 | 79.3 | 78.0 | | July | 178 | 141 | 79.2 | 74.8 | | Aug. | 179 | 142 | 79.3 | 75.1 | | Sept. | 183 | 141 | 77.0 | 76.5 | | Oct. | 170 | 142 | 83.5 | 79.5 | | Nov. | 166 | 141 | 84.9 | 81.5 | | Dec. | 162 | 140 | 86.4 | 85.3 | | 1922 Jan. | 159 | 138 | 86.8 | 86.8 | | Feb. | 158 | 141 | 89.1 | 89.6 | | March | 160 | 142 | 88.7 | 89.9 | | April | 159 | 143 | 89.9 | 90.7 | | May | 162 | 148 | 91.4 | 91.4 | | June | 163 | 150 | 92.0 | 91.5 | | July | 163 | 155 | 95.1 | 91.4 | | Aug. | 158 | 155 | 98.1 | 91.7 | | Sept. | 158 | 154 | 97.4 | 91.2 | | Nov.