Year | Value | 2019 | 33,368,909 | 2018 | 32,826,049 | 2017 | 31,954,592 | 2016 | 30,831,360 | 2015 | 29,780,340 | 2014 | 28,689,600 | 2013 | 27,839,270 | 2012 | 26,780,195 | 2011 | 26,285,363 | 2010 | 25,218,298 | 2009 | 24,207,113 | 2008 | 23,361,213 | 2007 | 22,626,117 | 2006 | 22,239,126 | 2005 | 22,316,274 | 2004 | 21,875,152 | 2003 | 21,909,698 | 2002 | 22,073,032 | 2001 | 21,768,238 | 2000 | 21,414,874 | 1999 | 22,203,014 | 1998 | 21,764,624 | 1997 | 21,215,774 | 1996 | 21,251,639 | 1995 | 20,944,086 | 1994 | 20,657,052 | 1993 | 19,234,777 | 1992 | 20,178,525 | 1991 | 20,041,385 | 1990 | 19,672,893 |
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