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| Saint Kitts and Nevis |
1995, 2000, 2004, 2010, 2015 and 2020 legislative elections |
| Saint Lucia |
1997, 2001, 2006, 2011, 2016 and 2021 legislative elections |
| Saint Vincent and the Grenadines |
2001, 2005, 2010, 2015 and 2020 legislative elections |
| Samoa |
2001, 2006, 2011, 2016 and 2021 legislative elections |
| San Marino |
1998, 2001, 2006, 2008, 2012, 2016 and 2019 legislative elections |
| Sao Tome and Principe |
2001, 2006, 2011, 2016 and 2021 presidential elections, 2006, 2010, 2014 and 2018 legislative elections |
| Saudi Arabia |
No elections |
| Senegal |
2000, 2007, 2012 and 2019 presidential elections; 2001, 2007, 2012 and 2017 legislative elections |
| Serbia |
2000, 2003, 2007, 2008, 2012, 2014, 2016 and 2020 legislative elections; 2002, 2003, 2004, 2008, 2012 and 2017 presidential elections |
| Seychelles |
2001, 2006, 2011 and 2015 presidential elections; 2002, 2007, 2011 and 2016 legislative elections |
| Sierra Leone |
2002, 2007, 2012 and 2018 presidential elections; 2002, 2007, 2012 and 2018 legislative elections |
| Singapore |
1999, 2005 and 2011 presidential elections; 1997, 2001, 2006, 2011, 2015 and 2020 legislative elections |
| Slovak Republic |
1999, 2004, 2009, 2014 and 2019 presidential elections; 1998, 2002, 2006, 2010, 2012, 2014 and 2020 legislative elections |
| Slovenia |
2002, 2007, 2012 and 2017 presidential elections; 2000, 2004, 2008, 2011, 2014 and 2018 legislative elections |
| Solomon Islands |
2001, 2006, 2010 and 2019 legislative elections |
| Somalia |
No elections |
| South Africa |
1994, 1999, 2004, 2009, 2014 and 2019 legislative elections |
| South Korea |
1997, 2002 and 2007 presidential elections; 2000, 2004, 2008 and 2012 legislative elections;
presidential elections since 1952 |
| South Sudan |
2010 presidential election |
| Spain |
2000, 2004, 2008, 2011, 2015, 2016, April 2019 and November 2019 legislative elections |
| Sri Lanka |
1999, 2005, 2010, 2015 and 2019 presidential elections; 2000, 2001, 2004, 2010, 2015 and 2020 legislative elections |
| Sudan |
2010 and 2015 presidential elections; 2015 legislative elections |
| Suriname |
2000, 2005, 2010, 2015 and 2020 legislative elections |
| Swaziland |
No elections |
| Sweden |
1998, 2002, 2006, 2010, 2014 and 2018 legislative elections |
| Switzerland |
1999, 2004, 2007, 2011, 2015 and 2019 legislative elections |
| Syria |
No elections |
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