$1.6 billion $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year 99.5 % of teachers $1.6 billion a year using their own money $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year study from the NSSEA $1.6 billion a year report $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year spent $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion $1.6 billion a year $1.6 billion a year $1.6 billion a year 99.5 % of teachers $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion One study $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year $1.6 billion a year