Change the type of the variable:
uint16_t data = Wire.read();
data += Wire.read() << 8;
Serial.print(data);
Although the correct value is:
uint16_t data = Wire.read();
data += Wire.read() << 8;
data >>= 2;
Serial.print(data);
because bit 0 and 1 of the LSB are "new_data" flag and 0.