With reference to Figure 1, explain one reason why the Labor Force Survey (ILO) measure of unemployment and the Claimant Count measure of unemployment differ.

| Year | ILO Measure (Millions) | Claimant Count (Millions) |
|---|---|---|
| 2008 | 1.62 | 0.90 |
| 2009 | 2.45 | 1.55 |
| 2010 | 2.48 | 1.50 |
| 2011 | 2.59 | 1.60 |
| 2012 | 2.51 | 1.56 |
| 2013 | 2.34 | 1.42 |