It appears that how people cope with mental health problems is getting worse as the number of people who self-harm or have suicidal thoughts is increasing 

Generalised anxiety disorder | 5.9 in 100 people
Depression | 3.3 in 100 people
Phobias   | 2.4 in 100 people
OCD  | 1.3 in 100 people
Panic disorder | 0.6 in 100 people
Post traumatic stress disorder (PTSD) | 4.4 in 100 people
Mixed anxiety and depression | 7.8 in 100 people

Estimates for bipolar disorder, psychotic disorder and personality disorders are usually measured over a person's lifetime, rather than each year. Estimates for the number of people with these diagnoses can vary quite a lot but the most recent reported findings are [2]:

Psychotic disorder  | 0.7 in 100 people*
Bipolar disorder  | 2.0 in 100 people
Antisocial personality disorder  | 3.3 in 100 people
Borderline personality disorder  | 2.4 in 100 people

*Measured over the last year.

The survey also measures the number of people who have self-harmed, had suicidal thoughts or have made suicidal attempts over their lifetime:

Suicidal thoughts | 20.6 in 100 people
Suicide attempts | 6.7 in 100 people
Self-harm | 7.3 in 100 people

Note: these statistics have been taken from studies that have surveyed people living in private housing in England [2]. The figures do not include the number of people experiencing mental health problems in hospitals, prisons, sheltered housing or people who are homeless. Therefore these figures may underestimate the prevalence of mental health problems.