Please kindly review my writing task 1

[Phyoe]

The line graph indicates the average amount of CO2, emitted per person in the UK, Sweden, Italy and Portugal over 40 years, from 1967 to 2007.
In general, while Italy and Portugal experienced increasing trends in CO2 emission, the remaining two countries saw downward trends over 40 years. The CO2 emission, in Portugal, per person gradually increased from more than 1 tonne, in 1967, to around 3 tonnes in 1987. Then the increase was dramatic till 1997, reaching over 5 tonnes, followed by a plateau. In contrast, the rise of CO2 emission per Italian was rapid in initial 10 years, from more than 4 tonnes to more than 6 tonnes, and it was fluctuated towards the end of the given period, reaching almost 8 tonnes. The fall for an average CO2 emission by an English was gradual over the period, by around 2 tonnes, from around 11 tones in 1967 whereas the dramatic fall of CO2 emission by a Swedish was preceded by a huge fluctuation, with a rapid rise in 1967, peaking in 1977 to more than 10 tonnes, and then fall rapidly to around 7 tonnes in 1987.
All in all, CO2 emission by one person in Portugal and Italy increased, and it decreased in the UK and Sweden. Although the UK decrease of CO2 emission was steady, the fall of CO2 emission of average one Swedish was huge, reaching the same amount of CO2 emitted per person in Portugal, by 2007.