When +18.1 is the yes side 2008 percentage what is the percentage of against?
CREATE TABLE table_2278 (
    "Constituency" text,
    "Electorate" real,
    "s Spoilt vote" real,
    "Total poll (%)" text,
    "For (%)" text,
    "Against (%)" text,
    "\u00b1 Yes side 2008 (%)" text
)
SELECT "Against (%)" FROM table_2278 WHERE "\u00b1 Yes side 2008 (%)" = '+18.1'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: When +18.1 is the yes side 2008 percentage what is the percentage of against? ### Input: CREATE TABLE table_2278 (
    "Constituency" text,
    "Electorate" real,
    "s Spoilt vote" real,
    "Total poll (%)" text,
    "For (%)" text,
    "Against (%)" text,
    "\u00b1 Yes side 2008 (%)" text
) ### Response: SELECT "Against (%)" FROM table_2278 WHERE "\u00b1 Yes side 2008 (%)" = '+18.1'