Year	Billions of British Pounds
1960-01-01	0.562
1961-01-01	0.279
1962-01-01	-0.008
1963-01-01	0.161
1964-01-01	0.700
1965-01-01	0.461
1966-01-01	0.288
1967-01-01	0.286
1968-01-01	0.452
1969-01-01	0.537
1970-01-01	0.382
1971-01-01	0.114
1972-01-01	0.025
1973-01-01	1.529
1974-01-01	1.045
1975-01-01	-1.354
1976-01-01	0.901
1977-01-01	1.824
1978-01-01	1.804
1979-01-01	2.162
1980-01-01	-2.572
1981-01-01	-2.768
1982-01-01	-1.188
1983-01-01	1.465
1984-01-01	1.296
1985-01-01	0.821
1986-01-01	0.659
1987-01-01	1.098
1988-01-01	4.375
1989-01-01	2.676
1990-01-01	-1.927
1991-01-01	-5.024
1992-01-01	-1.920
1993-01-01	0.300
1994-01-01	3.821
1995-01-01	4.391
1996-01-01	1.611
1997-01-01	5.755
1998-01-01	7.584
1999-01-01	2.224
2000-01-01	6.822
2001-01-01	6.776
2002-01-01	5.229
2003-01-01	6.884
2004-01-01	3.873
2005-01-01	3.688
2006-01-01	6.306
2007-01-01	6.849
2008-01-01	0.205
2009-01-01	-12.763
2010-01-01	5.454
2011-01-01	2.882
2012-01-01	2.025
2013-01-01	10.032
2014-01-01	12.513
2015-01-01	6.882
2016-01-01	8.405
2017-01-01	3.450