2017: 3.24 billion | 2003: 1.34 billion | 1989: 205.6 million |
2016: 3.2 billion | 2002: 1.18 billion | 1988: 170.4 million |
2015: 3.16 billion | 2001: 1.13 billion | 1987: 135.3 million |
2014: 3.09 billion | 2000: 1.12 billion | 1986: 102.4 million |
2013: 3.02 billion | 1999: 1.02 billion | 1985: 70.9 million |
2012: 2.87 billion | 1998: 874.1 million | 1984: 52.6 million |
2011: 2.75 billion | 1997: 750.0 million | 1983: 32.3 million |
2010: 2.43 billion | 1996: 652.8 million | 1982: 19.6 million |
2009: 2.31 billion | 1995: 562.4 million | 1981: 11.2 million |
2008: 2.26 billion | 1994: 481.9 million | 1980: 5.05 million |
2007: 2.15 billion | 1993: 420.2 million | 1979: 2.3 million |
2006: 1.90 billion | 1992: 365.5 million | 1978: 1.2 million |
2005: 1.68 billion | 1991: 295.4 million | 1977: 506,000 |
2004: 1.53 billion | 1990: 240.2 million | 1976: 138,000 |