I've often wondered why the lines had become so long at the major tourist sites. This is pretty much from the time I started traveling in Europe. The previous 20 years 1974 - 1995 the number of passports issued went from 2.4 million to 5.2 million. My guess is a good portion of those were for business travel.
EDIT: My guess is this is the same trend in many countries around the world - I just happened to be looking at US data.
U.S. Passports Issued per Fiscal Year (1996 - 2015)
Fiscal Year U.S. Passports Issued
2015 15,556,216 (includes 1,647,413 passport cards)
2014 14,087,341 (includes 1,463,191 passport cards)
2013 13,529,757 (includes 1,408,865 passport cards)
2012 13,125,829 (includes 1,300,145 passport cards)
2011 12,613,153 (includes 1,173,092 passport cards)
2010 14,794,604 (includes 1,556,392 passport cards)
2009 14,170,171 (includes 1,544,718 passport cards)
2008 16,132,536 (includes 189,560 passport cards)
2007 18,382,798
2006 12,133,537
2005 10,123,424
2004 8,825,410
2003 7,300,667
2002 7,001,482
2001 7,119,506
2000 7,292,182
1999 6,722,198
1998 6,539,864
1997 6,295,003
1996 5,547,693