Year	Million Current Pounds
1911	11.2000
1912	10.8000
1913	12.1800
1914	11.1800
1915	7.29000
1916	5.26000
1917	4.93000
1918	5.23000
1919	25.0700
1920	45.1500
1921	18.5900
1923	28.8500
1924	33.8000
1925	37.7300
1926	41.3200
1927	39.6100
1928	39.5500
1929	42.7100
1930	41.9600