Some
UPDATES! 07/07/2015
No news, just been where I've already been...
I'm from Italy, so:

Italy

France (1986, 1990, 1991, 1998, 2000, 2001, 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2013, 2014, 2015x2)

Monaco (1986, 2001, 2007, 2008, 2009, 2011)

Switzerland (1987, 1999, 2001, 2004, 2007, 2009, 2010,
2012, 2014)

United Kingdom (England & Scotland) (1996, 2004, 2008, 2010x2, 2011)

Ireland (1997)

Liechtenstein (1999)

Austria (1999, 2004, 2005, 2006, 2007, 2008, 2014, 2015)

Israel (2000, 2006, 2007)
Palestine (2000)

Vaticano (Holy See) (2000, 2005, 2008, 2014)

Spain (2001, 2005, 2006, 2009, 2010x2, 2013, 2015x2)

Greece (2001, 2007, 2012)

Slovenia (2001, 2007, 2011, 2013,
2014)

Nederlands (2001, 2005, 2006, 2007)

Germany (2001, 2002, 2004, 2005, 2006, 2007, 2008x2, 2009x2, 2010,
2011,
2012,
2013, 2014, 2015)

San Marino (2003)

Finland (2003, 2008)

Estonia (2003)

Sweden (2004)

Denmark (2004)

Portugal (2005, 2014)

Belgium (2006)

Luxemburg (2006)

United States, to be more precise CA, NV, UT, AZ (2006) and NY, NJ, NV, CA (2011)

Czech Republic (2006)

Hungary (2007)

Bulgaria (2007)

Kuwait (2007x2, 2009x2, 2010, 2012)

Oman (2007)

United Arab Emirates (2007x2,
2009, 2010, 2013)

Qatar (2007,
2010,
2012)

Russia (2008, 2011x2)

Saudi Arabia (2008)

Jordan (2008, 2009)

Romania (2008x2, 2009, 2010, 2011, 2013, 2014, 2015)

Malta (2008, 2012)

Poland (2008, 2010, 2013)

Tunisia (2008)

China (2008, 2009, 2011x3, 2013)

Morocco (2009x2, 2010)

Iran (2009)

Croatia (2009, 2011, 2014x2, 2015x2)

Nigeria (2010)

Turkey (2010, 2012, 2014)
Gibraltar (2010)
French Polynesia (2011)
Hong Kong (2011x3)
Macau (2011)

Taiwan (2011)
Brazil (2012) only stopover

Chile (2012, 2014x2)

Cyprus (2012)
Akrotiri British Sovreign Base (2012)
Turkish Republic of Northern Cyprus (2012)

India (2012, 2013, 2014x3, 2015)

Andorra (2013)
Argentina (2014) only stopover
UPDATE +0
So
51+6+1 as a whole! (counting Gibraltar, Palestine, Hong Kong, Macau, French Polynesia and British Sovreign Base as special regions; Nothern Cyprus quoted as extra) and including both Brasil and Argentina which are just flight stopovers