6.6

1949

6.2

1972

6.6

2015

4.6

1995

5.2

2008

4.7

1993

6.5

1994

6.6

1997

6.2

1980

5.9

2014

5.6

1980

6.3

2008

6.7

1966

7.1

2003

6.2

2006

6.1

1964

7.0

1995

4.6

1996

4.4

2000

4.3