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:
| Score | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 5 | 15.3% | 18.4% | 18.0% | 17.1% | 17.0% | 16.4% | 18.9% |
| 4 | 18.0% | 17.5% | 17.9% | 18.5% | 18.4% | 19.3% | 21.5% |
| 3 | 23.0% | 20.0% | 20.2% | 19.3% | 19.5% | 20.1% | 18.8% |
| 2 | 18.5% | 14.3% | 14.2% | 12.7% | 14.6% | 15.0% | 14.9% |
| 1 | 25.3% | 29.9% | 29.8% | 32.3% | 30.4% | 29.2% | 26.0% |
| Mean | 2.79 | 2.80 | 2.80 | 2.76 | 2.77 | 2.79 | 2.92 |
| Number of Students | 97,136 | 100,586 | 104,789 | 115,077 | 122,651 | 132,425 | 140,006 |
Question:
which year had the weakest score?
Answer:
2010