Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Country | GDP (USD bln, 2012) | GDP (USD bln, 2017) | GDP (USD PPP bln, 2012) | GDP (USD PPP bln, 2017) | Per capita (USD, 2012) | Per capita (USD, 2017) | Per capita (USD PPP, 2012) | Per capita (USD PPP, 2017) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Afghanistan | 19.85 | 28.45 | 31.80 | 45.30 | 619.89 | 766.43 | 993.23 | 1,220.52 |
| Albania | 12.39 | 14.75 | 25.86 | 31.55 | 3,821.09 | 4,435.73 | 7,975.86 | 9,489.11 |
| Algeria | 206.55 | 242.31 | 274.50 | 356.26 | 5,659.74 | 6,163.52 | 7,521.74 | 9,061.86 |
| Azerbaijan | 71.04 | 109.95 | 98.24 | 123.35 | 7,726.65 | 11,491.29 | 10,684.95 | 12,891.89 |
| Bahrain | 26.51 | 30.36 | 32.44 | 40.37 | 23,027.12 | 23,889.03 | 28,182.13 | 31,765.11 |
| Bangladesh | 118.69 | 177.66 | 305.51 | 462.42 | 791.09 | 1,122.90 | 2,036.23 | 2,922.78 |
| Benin | 7.54 | 11.14 | 15.51 | 20.74 | 806.38 | 1,048.35 | 1,658.02 | 1,952.09 |
| Brunei Darussalam | 16.85 | 18.15 | 21.94 | 28.31 | 38,801.27 | 37,516.64 | 50,526.35 | 58,522.83 |
| Burkina Faso | 10.27 | 15.28 | 24.03 | 36.52 | 591.83 | 785.64 | 1,384.18 | 1,877.68 |
| Cameroon | 24.51 | 34.16 | 50.32 | 70.79 | 1,142.25 | 1,407.23 | 2,345.29 | 2,915.94 |
| Chad | 9.72 | 10.96 | 21.34 | 27.02 | 905.32 | 899.03 | 1,986.44 | 2,217.06 |
| Comoros | 0.60 | 0.83 | 0.87 | 1.15 | 857.75 | 1,079.12 | 1,255.98 | 1,488.46 |
| Côte d'Ivoire | 24.27 | 37.03 | 39.64 | 61.66 | 1,038.74 | 1,366.89 | 1,696.15 | 2,276.02 |
| Djibouti | 1.36 | 2.00 | 2.38 | 3.36 | 1,570.59 | 2,039.31 | 2,745.19 | 3,431.50 |
| Egypt | 255.00 | 339.33 | 537.76 | 756.42 | 3,109.47 | 3,729.36 | 6,557.38 | 8,313.47 |
| Gabon | 16.80 | 18.00 | 26.71 | 32.68 | 10,908.38 | 10,881.51 | 17,338.98 | 19,762.74 |
| The Gambia | 0.94 | 1.39 | 3.50 | 5.38 | 508.68 | 657.09 | 1,891.76 | 2,548.81 |
| Guinea | 5.74 | 10.66 | 12.25 | 24.14 | 529.20 | 868.20 | 1,128.63 | 1,965.65 |
| Guinea-Bissau | 0.88 | 1.29 | 1.90 | 2.79 | 514.14 | 671.22 | 1,105.55 | 1,453.15 |
| Guyana | 2.79 | 3.98 | 6.16 | 8.49 | 3,596.44 | 5,053.25 | 7,950.28 | 10,788.87 |
| Indonesia | 894.85 | 1,842.78 | 1,211.96 | 1,814.58 | 3,660.42 | 7,022.67 | 4,957.55 | 6,915.24 |
| Iran | 483.78 | 671.01 | 1,006.54 | 1,173.48 | 6,355.74 | 8,269.55 | 13,103.90 | 14,462.05 |
| Iraq | 130.57 | 214.36 | 155.38 | 283.34 | 3,882.08 | 5,744.21 | 4,619.68 | 7,592.46 |
| Jordan | 31.35 | 46.33 | 38.67 | 51.61 | 4,901.28 | 6,464.77 | 6,044.40 | 7,201.71 |
| Kazakhstan | 200.64 | 339.57 | 232.35 | 339.77 | 12,021.22 | 20,243.27 | 13,920.87 | 20,255.29 |
| Kuwait | 174.63 | 193.10 | 165.94 | 212.73 | 46,142.29 | 44,467.96 | 43,846.72 | 48,990.11 |
| Kyrgyz Republic | 6.20 | 9.58 | 13.47 | 19.45 | 1,109.09 | 1,632.03 | 2,411.04 | 3,311.42 |
| Lebanon | 41.77 | 56.25 | 63.69 | 82.99 | 10,416.17 | 13,149.68 | 15,884.07 | 19,401.42 |
| Libya | 85.11 | 117.76 | 87.91 | 145.08 | 12,878.85 | 16,141.08 | 13,303.20 | 19,886.33 |
| Malaysia | 307.18 | 465.14 | 491.97 | 680.30 | 10,578.45 | 14,723.61 | 16,942.14 | 21,534.22 |
| Maldives | 1.98 | 2.69 | 2.89 | 3.67 | 5,976.79 | 7,473.76 | 8,730.17 | 10,217.39 |
| Mali | 9.60 | 13.39 | 17.35 | 24.27 | 587.49 | 702.87 | 1,061.75 | 1,273.87 |
| Mauritania | 4.10 | 5.64 | 7.62 | 10.97 | 1,128.91 | 1,380.28 | 2,098.81 | 2,686.63 |
| Morocco | 97.17 | 140.01 | 170.95 | 242.78 | 2,987.92 | 4,099.70 | 5,256.55 | 7,109.34 |
| Mozambique | 14.64 | 23.76 | 26.22 | 41.71 | 652.00 | 958.25 | 1,167.30 | 1,682.38 |
| Niger | 6.56 | 9.65 | 13.53 | 20.29 | 421.56 | 532.81 | 869.94 | 1,120.09 |
| Nigeria | 272.55 | 388.42 | 450.54 | 676.25 | 1,654.31 | 2,058.57 | 2,734.63 | 3,584.02 |
| Oman | 79.97 | 89.97 | 90.66 | 117.23 | 25,151.54 | 24,323.53 | 28,511.86 | 31,693.79 |
| Pakistan | 230.53 | 274.82 | 514.56 | 662.44 | 1,288.50 | 1,391.71 | 2,876.08 | 3,354.68 |
| Qatar | 184.57 | 237.85 | 188.96 | 274.46 | 100,377.54 | 106,320.28 | 102,768.69 | 122,684.13 |
| Saudi Arabia | 657.05 | 778.75 | 740.53 | 985.79 | 22,822.82 | 24,428.39 | 25,722.42 | 30,922.92 |
| Senegal | 13.95 | 19.55 | 26.50 | 37.10 | 1,013.34 | 1,261.40 | 1,925.30 | 2,393.44 |
| Sierra Leone | 3.82 | 5.71 | 8.38 | 12.78 | 621.22 | 816.31 | 1,360.58 | 1,825.47 |
| Sudan | 51.58 | 57.89 | 80.43 | 102.35 | 1,539.31 | 1,519.50 | 2,400.17 | 2,686.33 |
| Suriname | 5.09 | 8.06 | 6.69 | 9.19 | 9,338.99 | 13,821.78 | 12,255.19 | 15,755.24 |
| Syria | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
| Tajikistan | 7.26 | 10.91 | 17.61 | 25.60 | 911.98 | 1,235.12 | 2,210.56 | 2,897.11 |
| Togo | 3.62 | 4.67 | 6.90 | 9.75 | 574.95 | 664.32 | 1,094.46 | 1,385.73 |
| Tunisia | 44.70 | 54.84 | 104.41 | 143.65 | 4,151.92 | 4,835.23 | 9,698.13 | 12,665.06 |
| Turkey | 783.06 | 1,170.08 | 1,125.42 | 1,497.09 | 10,456.89 | 14,748.21 | 15,028.63 | 18,870.00 |
| Turkmenistan | 33.47 | 83.42 | 47.55 | 75.38 | 5,960.67 | 13,724.21 | 8,469.10 | 12,401.85 |
| Uganda | 20.46 | 29.89 | 50.59 | 75.86 | 574.07 | 712.81 | 1,419.17 | 1,809.06 |
| United Arab Emirates | 361.91 | 430.53 | 271.21 | 345.14 | 65,377.09 | 67,348.58 | 48,992.47 | 53,990.11 |
| Uzbekistan | 51.62 | 79.73 | 103.91 | 151.81 | 1,752.90 | 2,550.49 | 3,528.60 | 4,856.52 |
| Yemen | 36.37 | 53.00 | 57.76 | 78.18 | 1,405.13 | 1,768.01 | 2,231.69 | 2,608.10 |
Question:
what is the sum of the gdp (usd ppp bin, 2012) between niger and sierra?
Answer:
21.91