how many districts are large than 50 square kilometers?
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col : # | district | land area (km²) | population\n(2010 census) | density (persons/km²) row 1 : 1 | anse la raye | 30.9 | 6,247 | 210 row 2 : 2 | praslin | 16.0 | 2,044 | 119 row 3 : 3 | castries | 79.5 | 65,656 | 776 row 4 : 4 | choiseul | 31.3 | 6,098 | 206 row 5 : 5 | dennery | 69.7 | 12,599 | 182 row 6 : 6 | forest reserve | 78.0 | 0 | 0 row 7 : 7 | gros islet | 101.5 | 25,210 | 196 row 8 : 8 | laborie | 37.8 | 6,701 | 210 row 9 : 9 | micoud | 77.7 | 16,284 | 220 row 10 : 10 | soufrière | 50.5 | 8,472 | 144 row 11 : 11 | vieux fort | 43.8 | 16,284 | 371 row 12 :  | saint lucia | 608.7 | 165,595 | 256
how many districts are large than 50 square kilometers?
# District Land area (km²) Population\n(2010 census) Density (persons/km²)
1 Anse la Raye 30.9 6,247 210
2 Praslin 16.0 2,044 119
3 Castries 79.5 65,656 776
4 Choiseul 31.3 6,098 206
5 Dennery 69.7 12,599 182
6 Forest Reserve 78.0 0 0
7 Gros Islet 101.5 25,210 196
8 Laborie 37.8 6,701 210
9 Micoud 77.7 16,284 220
10 Soufrière 50.5 8,472 144
11 Vieux Fort 43.8 16,284 371
Saint Lucia 608.7 165,595 256
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