| 2010 | 2011 | 2012 | 2013 |
Administrative Expenses | 2465163.48 | 4329998.30 | 5136971.14 | 9522636.51 |
Period Costs | 4950146.62 | 6797128.75 | 10064060.99 | 19762103.09 |
Ratio of Administrative Expenses to Period Costs | 49.80% | 63.70% | 51.04% | 48.19% |