party_map = {
    "Before 1900": 'England and Wales: before 1900',
    "1900-1929": 'England and Wales: 1900-1929',
    "1930-1949": 'England and Wales: 1930-1949',
    "1950-1966": 'England and Wales: 1950-1966',
    "1967-1975": 'England and Wales: 1967-1975',
    "1976-1982": 'England and Wales: 1976-1982',
    "1983-1990": 'England and Wales: 1983-1990',
    "1991-1995": 'England and Wales: 1991-1995',
    "1996-2002": 'England and Wales: 1996-2002',
    "2003-2006": 'England and Wales: 2003-2006',
    "2007-2011": 'England and Wales: 2007-2011',
    "2012 onwards": 'England and Wales: 2012-2021',
}