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:
| Index (Year) | Author / Editor / Source | Year of publication | Countries sampled | World Ranking (1) | Ranking L.A. (2) |
| --- | --- | --- | --- | --- | --- |
| Global Peace (2009) | The Economist | 2008 | 140.0 | 21st | 2nd |
| Corruption Perception (2008) (6) | Transparency International | 2008 | 180.0 | 23rd | 1st |
| Democracy (2006) | The Economist | 2007 | 167.0 | 23rd | 2nd |
| Prosperity Index (2008) | Legatum Institute | 2008 | 104.0 | 36th | 3rd |
| Press Freedom (2007) | Reporters Without Borders | 2007 | 169.0 | 37th | 2nd |
| Economic Freedom (2008) | The Wall Street Journal | 2008 | 157.0 | 38th | 3rd |
| Human Development (2005) | United Nations (UNDP) | 2007–08 | 177.0 | 46th | 3rd |
| Quality-of-life (2005) | The Economist | 2007 | 111.0 | 46th | 6th |
| Travel and Tourism Competitiveness (2008) | World Economic Forum | 2008 | 130.0 | 63rd | 7th |
| Global Competitiveness (2009–2010) | World Economic Forum | 2009–10 | 131.0 | 65th | 6th |
Question:
How many years were listed under index when there were 157 countries sampled?
Answer:
1.0