1970

6.4

2003

7.6

2003

7.3

1971

6.2

1993

7.4

1986

6.9

1982

6.7

1984

5.6

2014

6.6

2014

7.4

2002

6.2

2010

8.2

2003

6.9

2002

7.7

1997

6.6

1976

6.6

2010

5.3

2016

6.3

2018

6.8

1965

6.8